Just to complete the story - the cause was a coding error. I had only partially registered the plugin.
-----Original Message-----
From: wireshark-dev-bounces@xxxxxxxxxxxxx [mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] On Behalf Of Paul Offord
Sent: 14 April 2017 21:27
To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
Subject: Re: [Wireshark-dev] Debugging an assertion failure
Thanks to all for the suggestions.
The assertion fails because the module name being passed is (none) and obviously the parenthesis are a problem. I think I know what's causing this and I'll investigate tomorrow.
I eventually settled on Graham's suggestion to catch it and changed the code to:
for (p = name; (c = *p) != '\0'; p++)
{
if (g_ascii_islower(c) || g_ascii_isdigit(c) || c == '_' || c == '-' || c == '.') {
int dummy = 0; // breakpoint here.
}
else
{
int dummy2 = 0;
}
g_assert(g_ascii_islower(c) || g_ascii_isdigit(c) || c == '_' ||
c == '-' || c == '.');
}
And then set a break point on the dummy2 line.
Best regards...Paul
-----Original Message-----
From: wireshark-dev-bounces@xxxxxxxxxxxxx [mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] On Behalf Of Guy Harris
Sent: 14 April 2017 20:46
To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
Subject: Re: [Wireshark-dev] Debugging an assertion failure
On Apr 14, 2017, at 12:41 PM, Guy Harris <guy@xxxxxxxxxxxx> wrote:
> On Apr 14, 2017, at 3:41 AM, Paul Offord <Paul.Offord@xxxxxxxxxxxx> wrote:
>
>> I need some advice. I’m debugging a problem with a dissector I’ve written. Tshark fails with:
>> … \epan\prefs.c:414:prefs_register_module_or_subtree: assertion
>> failed: (g_ascii_islower(c) || g_ascii_isdigit(c) || c == '_' || c ==
>> '-' || c == '.')
>
> Your dissector probably has, in its "filter name", a character that is not any of 'a'-'z', '_', '-', or '.'.
No, that's "your *protocol* probably has...", but the code to register a protocol should already be catching that and failing.
So perhaps you're directly calling prefs_register_module() and passing it a module name containing a character that's not one of those. Don't do that in a dissector - call prefs_register_protocol(), which uses the protocol's filter name as the preferences module name.
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